Dibromochloromethane
North Marin Water District
Dibromochloromethane, one of the total trihalomethanes (TTHMs), is formed when chlorine or other disinfectants are used to treat drinking water. Dibromochloromethane and other disinfection byproducts increase the risk of cancer and may cause problems during pregnancy. Click here to read more about disinfection byproducts.
233
Samples
0
Samples exceeding legal limit (MCL)
220
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | 4.37 ppb | 38 | 38 | 1.86 ppb - 8.27 ppb |
| 2015 | 4.86 ppb | 40 | 40 | 1.15 ppb - 9.52 ppb |
| 2016 | 4.10 ppb | 39 | 33 | ND - 6.84 ppb |
| 2017 | 3.49 ppb | 39 | 34 | ND - 6.26 ppb |
| 2018 | 4.58 ppb | 38 | 37 | ND - 9.44 ppb |
| 2019 | 3.69 ppb | 39 | 38 | ND - 6.13 ppb |
ppb = parts per billion
State and national drinking water standards and health guidelines
EWG Health Guideline 0.1 ppb
The EWG Health Guideline of 0.1 ppb for dibromochloromethane was proposed in 2018 by the California Office of Environmental Health Hazard Assessment as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-02-05 | 1610-001-1409 | 3.01 ppb |
| 2014-02-05 | 1610-005-1213 | 8.27 ppb |
| 2014-02-05 | 1610-006-1142 | 3.70 ppb |
| 2014-02-05 | 1610-007-1315 | 3.80 ppb |
| 2014-02-05 | 1610-008-1223 | 2.65 ppb |
| 2014-02-05 | 1610-009-1135 | 4.11 ppb |
| 2014-02-05 | 1610-014-1156 | 3.11 ppb |
| 2014-02-05 | 1610-015-1336 | 2.93 ppb |
| 2014-02-05 | 1610-017-1349 | 2.75 ppb |
| 2014-05-07 | 1610-001-1343 | 5.00 ppb |
| 2014-05-07 | 1610-004-1454 | 1.86 ppb |
| 2014-05-07 | 1610-005-1507 | 2.42 ppb |
| 2014-05-07 | 1610-006-1323 | 6.39 ppb |
| 2014-05-07 | 1610-007-1156 | 5.94 ppb |
| 2014-05-07 | 1610-008-1517 | 2.66 ppb |
| 2014-05-07 | 1610-009-1316 | 4.83 ppb |
| 2014-05-07 | 1610-014-1332 | 5.76 ppb |
| 2014-05-07 | 1610-015-1248 | 6.12 ppb |
| 2014-05-07 | 1610-017-1300 | 4.90 ppb |
| 2014-08-06 | 1610-001-1412 | 4.24 ppb |
| 2014-08-06 | 1610-004-1246 | 2.33 ppb |
| 2014-08-06 | 1610-005-1426 | 2.81 ppb |
| 2014-08-06 | 1610-006-1157 | 6.00 ppb |
| 2014-08-06 | 1610-007-1342 | 5.95 ppb |
| 2014-08-06 | 1610-008-1301 | 2.94 ppb |
| 2014-08-06 | 1610-009-1148 | 4.22 ppb |
| 2014-08-06 | 1610-014-1207 | 5.31 ppb |
| 2014-08-06 | 1610-015-1325 | 5.75 ppb |
| 2014-08-06 | 1610-017-1312 | 4.99 ppb |
| 2014-11-05 | 1610-001-1345 | 4.04 ppb |
| 2014-11-05 | 1610-005-1205 | 6.48 ppb |
| 2014-11-05 | 1610-006-1142 | 5.06 ppb |
| 2014-11-05 | 1610-007-1317 | 5.04 ppb |
| 2014-11-05 | 1610-008-1240 | 4.06 ppb |
| 2014-11-05 | 1610-009-1135 | 3.98 ppb |
| 2014-11-05 | 1610-014-1152 | 4.45 ppb |
| 2014-11-05 | 1610-015-1301 | 3.84 ppb |
| 2014-11-05 | 1610-017-1252 | 4.42 ppb |
| 2015-02-12 | 1610-001-1322 | 4.54 ppb |
| 2015-02-12 | 1610-006-1134 | 4.62 ppb |
| 2015-02-12 | 1610-007-1207 | 4.04 ppb |
| 2015-02-12 | 1610-008-1255 | 4.62 ppb |
| 2015-02-12 | 1610-009-1127 | 4.37 ppb |
| 2015-02-12 | 1610-014-1311 | 4.58 ppb |
| 2015-02-12 | 1610-015-1227 | 4.71 ppb |
| 2015-02-12 | 1610-017-1240 | 4.64 ppb |
| 2015-02-13 | 1610-004-1148 | 1.15 ppb |
| 2015-02-13 | 1610-005-1200 | 1.43 ppb |
| 2015-05-06 | 1610-001-1413 | 4.75 ppb |
| 2015-05-06 | 1610-004-1354 | 1.50 ppb |
| 2015-05-06 | 1610-005-1146 | 2.23 ppb |
| 2015-05-06 | 1610-006-1217 | 5.87 ppb |
| 2015-05-06 | 1610-007-1251 | 6.30 ppb |
| 2015-05-06 | 1610-008-1338 | 2.37 ppb |
| 2015-05-06 | 1610-009-1224 | 4.59 ppb |
| 2015-05-06 | 1610-014-1207 | 5.90 ppb |
| 2015-05-06 | 1610-015-1309 | 4.99 ppb |
| 2015-05-06 | 1610-017-1321 | 5.48 ppb |
| 2015-08-05 | 1610-001-1343 | 6.77 ppb |
| 2015-08-05 | 1610-004-1139 | 1.64 ppb |
| 2015-08-05 | 1610-005-1330 | 2.53 ppb |
| 2015-08-05 | 1610-006-1106 | 9.22 ppb |
| 2015-08-05 | 1610-007-1258 | 9.52 ppb |
| 2015-08-05 | 1610-008-1214 | 2.83 ppb |
| 2015-08-05 | 1610-009-1049 | 7.18 ppb |
| 2015-08-05 | 1610-014-1118 | 8.19 ppb |
| 2015-08-05 | 1610-015-1240 | 7.57 ppb |
| 2015-08-05 | 1610-017-1227 | 7.34 ppb |
| 2015-11-18 | 1610-001-1411 | 4.64 ppb |
| 2015-11-18 | 1610-004-1134 | 1.57 ppb |
| 2015-11-18 | 1610-005-1355 | 2.29 ppb |
| 2015-11-18 | 1610-006-1318 | 5.79 ppb |
| 2015-11-18 | 1610-007-1256 | 6.99 ppb |
| 2015-11-18 | 1610-008-1159 | 2.85 ppb |
| 2015-11-18 | 1610-009-1324 | 5.23 ppb |
| 2015-11-18 | 1610-014-1334 | 7.70 ppb |
| 2015-11-18 | 1610-015-1240 | 4.89 ppb |
| 2015-11-18 | 1610-017-1212 | 7.10 ppb |
| 2016-02-10 | 1610-001-1316 | 3.81 ppb |
| 2016-02-10 | 1610-005-1154 | 6.84 ppb |
| 2016-02-10 | 1610-006-1254 | 4.76 ppb |
| 2016-02-10 | 1610-007-1109 | 5.74 ppb |
| 2016-02-10 | 1610-008-1229 | 3.63 ppb |
| 2016-02-10 | 1610-009-1247 | 4.26 ppb |
| 2016-02-10 | 1610-014-1305 | 4.79 ppb |
| 2016-02-10 | 1610-015-1128 | 3.64 ppb |
| 2016-02-10 | 1610-017-1139 | 4.92 ppb |
| 2016-05-11 | 1610-001-1418 | 3.74 ppb |
| 2016-05-11 | 1610-004-1504 | 1.67 ppb |
| 2016-05-11 | 1610-005-1516 | 2.62 ppb |
| 2016-05-11 | 1610-006-1353 | 5.83 ppb |
| 2016-05-11 | 1610-007-1333 | 5.34 ppb |
| 2016-05-11 | 1610-008-1248 | 3.06 ppb |
| 2016-05-11 | 1610-009-1400 | 5.07 ppb |
| 2016-05-11 | 1610-014-1407 | 5.63 ppb |
| 2016-05-11 | 1610-015-1312 | 4.90 ppb |
| 2016-05-11 | 1610-017-1301 | 4.71 ppb |
| 2016-08-10 | 1610-001-1401 | 4.88 ppb |
| 2016-08-10 | 1610-004-1301 | ND |
| 2016-08-10 | 1610-005-1315 | ND |
| 2016-08-10 | 1610-006-1116 | 5.36 ppb |
| 2016-08-10 | 1610-007-1136 | 5.55 ppb |
| 2016-08-10 | 1610-008-1232 | ND |
| 2016-08-10 | 1610-009-1111 | 4.94 ppb |
| 2016-08-10 | 1610-014-1352 | 5.23 ppb |
| 2016-08-10 | 1610-015-1158 | 5.53 ppb |
| 2016-08-10 | 1610-017-1213 | 5.53 ppb |
| 2016-11-09 | 1610-001-1154 | 4.84 ppb |
| 2016-11-09 | 1610-004-1212 | ND |
| 2016-11-09 | 1610-005-1230 | ND |
| 2016-11-09 | 1610-006-1132 | 5.58 ppb |
| 2016-11-09 | 1610-007-1335 | 5.52 ppb |
| 2016-11-09 | 1610-008-1240 | ND |
| 2016-11-09 | 1610-009-1115 | 5.43 ppb |
| 2016-11-09 | 1610-014-1143 | 6.05 ppb |
| 2016-11-09 | 1610-015-1252 | 5.19 ppb |
| 2016-11-09 | 1610-017-1359 | 5.23 ppb |
| 2017-02-08 | 1610-001-1444 | ND |
| 2017-02-08 | 1610-005-1219 | 5.69 ppb |
| 2017-02-08 | 1610-006-1139 | 4.02 ppb |
| 2017-02-08 | 1610-007-1403 | 4.25 ppb |
| 2017-02-08 | 1610-008-1227 | 3.46 ppb |
| 2017-02-08 | 1610-009-1132 | 3.54 ppb |
| 2017-02-08 | 1610-014-1152 | 4.07 ppb |
| 2017-02-08 | 1610-015-1347 | 3.47 ppb |
| 2017-02-08 | 1610-017-1246 | 3.80 ppb |
| 2017-05-10 | 1610-001-1256 | 4.47 ppb |
| 2017-05-10 | 1610-004-1041 | ND |
| 2017-05-10 | 1610-005-1311 | 2.75 ppb |
| 2017-05-10 | 1610-006-0940 | 4.49 ppb |
| 2017-05-10 | 1610-007-1148 | 4.46 ppb |
| 2017-05-10 | 1610-008-1107 | 2.91 ppb |
| 2017-05-10 | 1610-009-0930 | 3.90 ppb |
| 2017-05-10 | 1610-014-0950 | 4.03 ppb |
| 2017-05-10 | 1610-015-1134 | 4.13 ppb |
| 2017-05-10 | 1610-017-1122 | 4.03 ppb |
| 2017-08-09 | 1610-001-1628 | 3.85 ppb |
| 2017-08-09 | 1610-004-1701 | 1.72 ppb |
| 2017-08-09 | 1610-005-1718 | 2.30 ppb |
| 2017-08-09 | 1610-006-1603 | 5.86 ppb |
| 2017-08-09 | 1610-007-1425 | 6.26 ppb |
| 2017-08-09 | 1610-008-1524 | 2.80 ppb |
| 2017-08-09 | 1610-009-1551 | 4.69 ppb |
| 2017-08-09 | 1610-014-1616 | 6.03 ppb |
| 2017-08-09 | 1610-015-1445 | 5.39 ppb |
| 2017-08-09 | 1610-017-1459 | 5.35 ppb |
| 2017-11-08 | 1610-001-1028 | 2.99 ppb |
| 2017-11-08 | 1610-004-1046 | ND |
| 2017-11-08 | 1610-005-1059 | ND |
| 2017-11-08 | 1610-006-1009 | 3.72 ppb |
| 2017-11-08 | 1610-007-1157 | 4.01 ppb |
| 2017-11-08 | 1610-008-1108 | ND |
| 2017-11-08 | 1610-009-1001 | 3.48 ppb |
| 2017-11-08 | 1610-014-1019 | 3.87 ppb |
| 2017-11-08 | 1610-015-1135 | 3.31 ppb |
| 2017-11-08 | 1610-017-1121 | 2.94 ppb |
| 2018-02-14 | 1610-001-1343 | 3.41 ppb |
| 2018-02-14 | 1610-005-1159 | 7.64 ppb |
| 2018-02-14 | 1610-006-1122 | 4.29 ppb |
| 2018-02-14 | 1610-007-1241 | 4.92 ppb |
| 2018-02-14 | 1610-008-1146 | 3.45 ppb |
| 2018-02-14 | 1610-009-1115 | 3.85 ppb |
| 2018-02-14 | 1610-014-1133 | 4.38 ppb |
| 2018-02-14 | 1610-015-1227 | 3.56 ppb |
| 2018-02-14 | 1610-017-1213 | 3.82 ppb |
| 2018-05-09 | 1610-001-1533 | 3.60 ppb |
| 2018-05-09 | 1610-004-1445 | ND |
| 2018-05-09 | 1610-005-1511 | 1.13 ppb |
| 2018-05-09 | 1610-006-1400 | 5.73 ppb |
| 2018-05-09 | 1610-007-1215 | 5.13 ppb |
| 2018-05-09 | 1610-008-1314 | 1.80 ppb |
| 2018-05-09 | 1610-009-1347 | 3.94 ppb |
| 2018-05-09 | 1610-014-1330 | 4.12 ppb |
| 2018-05-09 | 1610-015-1235 | 3.44 ppb |
| 2018-05-09 | 1610-017-1256 | 4.64 ppb |
| 2018-08-15 | 1610-001-1115 | 4.88 ppb |
| 2018-08-15 | 1610-005-1143 | 6.02 ppb |
| 2018-08-15 | 1610-006-1056 | 7.01 ppb |
| 2018-08-15 | 1610-007-1235 | 7.01 ppb |
| 2018-08-15 | 1610-008-1151 | 5.52 ppb |
| 2018-08-15 | 1610-009-1049 | 4.12 ppb |
| 2018-08-15 | 1610-014-1106 | 6.66 ppb |
| 2018-08-15 | 1610-015-1220 | 5.54 ppb |
| 2018-08-15 | 1610-017-1205 | 5.99 ppb |
| 2018-08-16 | 1610-004-1010 | 1.56 ppb |
| 2018-11-16 | 1610-001-1139 | 4.28 ppb |
| 2018-11-16 | 1610-005-1528 | 9.44 ppb |
| 2018-11-16 | 1610-006-1240 | 4.79 ppb |
| 2018-11-16 | 1610-007-1421 | 5.41 ppb |
| 2018-11-16 | 1610-008-1301 | 4.96 ppb |
| 2018-11-16 | 1610-009-1222 | 4.41 ppb |
| 2018-11-16 | 1610-014-1203 | 4.64 ppb |
| 2018-11-16 | 1610-015-1349 | 4.78 ppb |
| 2018-11-16 | 1610-017-1328 | 4.31 ppb |
| 2019-02-20 | 1610-001-1459 | 2.26 ppb |
| 2019-02-20 | 1610-005-1305 | 6.13 ppb |
| 2019-02-20 | 1610-006-1236 | 3.42 ppb |
| 2019-02-20 | 1610-007-1424 | 3.74 ppb |
| 2019-02-20 | 1610-008-1335 | 2.83 ppb |
| 2019-02-20 | 1610-009-1226 | 3.23 ppb |
| 2019-02-20 | 1610-014-1249 | 3.72 ppb |
| 2019-02-20 | 1610-015-1405 | 2.90 ppb |
| 2019-02-20 | 1610-017-1348 | 3.52 ppb |
| 2019-05-08 | 1610-001-1600 | 3.84 ppb |
| 2019-05-08 | 1610-004-1445 | 1.82 ppb |
| 2019-05-08 | 1610-005-1500 | 2.17 ppb |
| 2019-05-08 | 1610-006-1255 | 4.41 ppb |
| 2019-05-08 | 1610-007-1330 | 4.41 ppb |
| 2019-05-08 | 1610-008-1541 | 2.72 ppb |
| 2019-05-08 | 1610-009-1310 | 4.07 ppb |
| 2019-05-08 | 1610-014-1237 | 4.17 ppb |
| 2019-05-08 | 1610-015-1351 | 4.04 ppb |
| 2019-05-08 | 1610-017-1410 | 4.15 ppb |
| 2019-08-14 | 1610-001-1342 | 5.03 ppb |
| 2019-08-14 | 1610-004-1431 | ND |
| 2019-08-14 | 1610-005-1255 | 1.06 ppb |
| 2019-08-14 | 1610-006-1143 | 5.85 ppb |
| 2019-08-14 | 1610-007-1210 | 5.08 ppb |
| 2019-08-14 | 1610-008-1304 | 1.11 ppb |
| 2019-08-14 | 1610-009-1133 | 5.63 ppb |
| 2019-08-14 | 1610-014-1154 | 5.87 ppb |
| 2019-08-14 | 1610-015-1226 | 3.73 ppb |
| 2019-08-14 | 1610-017-1240 | 5.01 ppb |
| 2019-11-13 | 1610-001-1155 | 3.83 ppb |
| 2019-11-13 | 1610-004-1212 | 1.43 ppb |
| 2019-11-13 | 1610-005-1224 | 2.05 ppb |
| 2019-11-13 | 1610-006-1134 | 5.60 ppb |
| 2019-11-13 | 1610-007-1315 | 5.30 ppb |
| 2019-11-13 | 1610-008-1235 | 2.40 ppb |
| 2019-11-13 | 1610-009-1125 | 4.02 ppb |
| 2019-11-13 | 1610-014-1146 | 5.40 ppb |
| 2019-11-13 | 1610-015-1302 | 3.43 ppb |
| 2019-11-13 | 1610-017-1249 | 4.64 ppb |